Match the following columns:

Column-$I$	Column-$II$
$(a)$ Lymphocytes	$(I)$ Responsible for the immune responses of the body
$(b)$ Monocytes	$(II)$ Are the agranulocytes
$(c)$ Neutrophils	$(III)$ Most abundant cells of the total WBCs
$(d)$ Basophils	$(IV)$ Inflammatory reactions

Select the correct option for myogenic and neurogenic hearts.

Choose the correct option:
$(1)$ Depolarization of the ventricles induces the $QRS$ / $T$ waves.
$(2)$ Incomplete double circulation is seen in reptiles / birds.

The given figure shows the schematic plan of blood circulation in humans with labels $A$ to $D$. Identify the label and give its function/functions.

Assertion $A$: In an open circulatory system,the blood volume is high,but the blood pressure is low and irregular.
Reason $R$: In a closed circulatory system,the blood volume is limited,and the blood pressure is high and regular.
Which option is correct for Assertion $A$ and Reason $R$?

Consider the following four statements regarding the human circulatory system:
$(a)$ Arteries have thick walls and have a smaller lumen compared to veins.
$(b)$ Angina is a sudden chest pain.
$(c)$ In the $ABO$ blood grouping system,a person with $AB$ blood group can donate blood to anyone.
$(d)$ Calcium ions play an important role in blood clotting.
Which two of the above statements are correct?